Scientists Develop New Approach to Suppress Lithium Dendrite Growth in Metal Batteries

Scientists have developed a new approach to tackle lithium dendrite growth, a persistent challenge in lithium metal batteries. com, introduces the interfacial excess charge distribution factor as a key descriptor. This factor integrates electrode surface excess charge, charge depletion rate, and solvation chemistry, providing a unified view of processes that prior research often treated separately.

Existing studies have focused on diffusion-reaction mismatches or electrode surface excess charge in isolation. The new work shifts emphasis to coupled interfacial processes at the nanoscale solid-liquid interface.

To monitor these dynamics, researchers proposed an electrochemical method for tracking lithium dendrite growth rates in real time. This technique reveals how electrolytes with rapid excess charge redistribution promote planar lithium plating, reducing the irregular deposits that shorten battery life.

com reported that such redistribution prevents the uneven growth that plagues high-energy-density batteries.

The depletion rate of interfacial excess charge hinges on lithium ion-dipole-anion interactions within the electrolyte. Meanwhile, the degree of electrode excess charge is modulated by solvation structures and cation screening effects. These elements compete to shape the overall interfacial excess charge dynamics, influencing whether lithium deposits evenly or forms harmful dendrites.

Drawing on these insights, the research team designed an electrolyte with optimized excess charge redistribution capability. This formulation suppresses dendrite formation effectively, even under demanding conditions. 4 Ah lithium metal batteries, a capacity suitable for advanced portable and electric vehicle applications.

The work offers mechanistic insight into how competitive interfacial processes dictate lithium dendrite growth. Experiments underpinning the study included advanced measurements at the Synchrotron Light Research Institute in Thailand and the China Spallation Neutron Source. These facilities provided precise data on charge distributions and solvation behaviors at the atomic scale.

Funding for the research came from grants by the National Natural Science Foundation of China, the Shenzhen Science and Technology Program, and the Guangdong Basic and Applied Basic Research Foundation. The approach builds on the need for safer, longer-lasting batteries amid growing demand for energy storage solutions.